Yarn cutting and clamping device



Oct. 18, 1932. H. B. AARONSON 1,883,320

`{YARN CUTTING AND CLAMPING DEVICE Filed Dec. 12, 1951 2 Sheets-Sheet l 47 Z f w w3 e "it 55 1E 60 64 n M Alli Z 37 'i f 63 J7 i l 65 'N1 57 1 17691- 5% M l lllll l ii Lzz lll I' mv W/ Oct. 18, 1932. H. IB. AARONSON 1,883,320'

YARN CUTTING AND GLAMPING DEVICE Filed Dec. l2, 1951 2 Sheets-Sheet 2 Patented Oct. 18, 1932 UNITED STATES PATENT OFFICE HARRY B. AARONSON, OF CAMDEN, NEW JERSEY, ASSIGNOR TO H. BRINTON COMPANY, F PHILADELPHIA, PENNSYLVANIA, A CORPORATION YARN outremerv AND CLAMPING DEVICE Application led December 12, 17931. Serial No. 580,680.

My said invention relates to'yarn changers and it is an object of the same to provide a device of this character with improved yarn cutting and clamping means, which device is pattern controlled in improved manner in such way that all parts operate simply and positively to supply a new yarn to the needles while idling another yarn and severing the same and holding the end of the idle yarn. The device is intended more particularly for use with an open top knitting machine but is not limited to use with such machines.

Referring to the drawings, which are made a part of this application and in which similar reference characters indicate similar parts:

Fig. 1 is a front elevation of my device,

Fig. 2, a section on line 2-72 of Fig. 1, with parts omitted,

Figs. 3, 4 land 5, details of the yarn clamping means,

Fig. 6, a side elevation viewed from the right in Fig. 1, and

Fig. 7 a plan of the device.

In the drawings reference character 10 indicates a base member having upward eX- tensions 11 carrying a pin 12 on which are pivoted a number of yarn iingers 13 provided with extensions 14 at their forward side having yarn guiding eyes for guiding the yarns to the needles as the needles pass along the latch opener 15 which has a throat at 16. The yarn fingers are biased to move into the idle position indicated at a in Fig. 1 by means of springs 17 which are connected at their upper ends to arm 18 of an L-shaped plate, the lower arm 19 of which is secured to the extensions 11.

Underneath the arm 19 and between the extensions 11 there are a number of parallel actuators 2O which move radially in and out in parallel planes, the actuators being guided by the extensions 11, the arm 19 and a pair of guide pins 21 supported by the extensions 11. The plates each have a pair of lingers 22 and 23 embracing the rear end of a yarninger 13, the finger 22 bearing against a tail 24 on its corresponding yarn finger. Each actuator also has a lug 25 at its rear or outer end and it wiil be seen that if pressure is exerted against the iug of the actuator whose finger is in idle position a the yarn finger will be moved by engagement of its tail 24 with finger 22 of the actuator toward marking position Z). The rearward movement of the 55 actuators is limited by engagement of a lug 26 with the outermost pin 21, such limitation being necessary due to the action of the spring 17 on the actuator through tail 24 of the yarn linger and iinger 22 of the actuator.

For holding a yarn finger in idle position I provide a detent 27 for each yarn finger, said detents having a common pivot 28 and being biased by the springs 29 toward the position shown in Fig. 2, which springs are each connectedat one end to a detent and at the other end to a pin 30 supported by the extensions 11. Each detent has a. forward extension 31 coacting with a shoulder at 32 on the finger 23 of its actuator 2O and it will be evident that whenever an actuator is moved far enough to bring its yarn finger into the working position o the corresponding detent will engage with the shoulder 32. At its rear end each detent is provided with a tail 33 having 7 a cam face as indicated in Fig. 2.

At the side of the supporting device for the yarn lingers remote from the direction of approach of the needles there is supported on the right hand extension 11 in Fig. 1 a bracket 34 having at its lower end an extension 35, this bracket being supported on the eXtension 11 by screws 36 or in any7 other suitable manner. A shaft 37 journalled at one end in extension and at the other end in a lug 38 on the bracket 34 carries at its lower end a pinion 39 meshing with pinion 40 on a stub shaft 41 in a block 42 supported in extension 35, the pinion 4G being forced toward the pinion 39 by a spring 43 bearing against block 42, the tension of the spring being adjustable by means of a screw 44 having a lock nut 45. The teeth of pinion 39 are undercut, as indicated at 39 (Fig. 3) to enable them to p catch an idled yarn and carry it between the pinions 39 and 40. A plate 46 secured to eX- tension 35 substantially covers the pinion 40, as shown in Fig. 4 and bends the cut-off ends of yarn, which are attached to the fabric,

away from the pinions 39, 40, pushing the loose ends down away from said pinions.

The shaft 37 at its upper end is provided with a beveled pinion 47 meshing with a beveled pinion 48 on a shaft 49 j ournaled in upward extensions of bracket 34 and having at its rear end a beveled pinion 50 meshing with a beveled pinion 51 on a vertical shaft 52 (Fig. 7) journaled in another extension on said bracket. The shaft 52 at its lower end carries a star wheel 53 adapted to be moved step by step by means of a suitable pattern controlled element such as a pin indicated at 54.

At the right hand sidein Fig. 1 the bracket is provided with a screw 55 on which there is pivotally supported a lever 56 having as its lower arm a movable shear blade 57 which coacts with a fixed shear blade 58 (Fig. 6) to cut off an idled yarn after the same has been received between the pinions 39 and 40. A compression spring 59 serves to force the shear blade 57 toward the iixed blade 58. At its upper end the lever 56 is connected to a link 60 which at its other end engages a rock arm 61`having a slot at 62 through which a screw 63 passes. The screw 63 connects the rock arm 61 to a rock arm 64 and it will be seen that the slot 62 and screw 63 provide adjustable means whereby the position of the rock arm 64 may be varied, this arm being positioned for engagement by the same pattern controlled element 54 which operates the star wheel 53. A screw at 65 serves to open the shear blade by moving the lever 56 clockwise in Fig. 6 against a stop at 66.

A guard plate 67 extends outward and laterally of the shear blade 57, said plate being secured to bracket 34 by screws 68. The function of the guard plate is to guide an idled yarn away from the needles after it is clamped by pinions 39, 40 and until after it has been cut off.

The pattern mechanism for controlling the yarn changer comprises a vertically slidable rod 69 guided in a bracket 70 of known type which, in a stationary needle cylinder machine such as here contemplated, is mounted on a fixed part of the machine frame. Rod 69 supports a plate 71 having a cam face at 72 for pushing in and holding in place a desired actuator 20, so that it will be locked in by its detent 27.

Plate 73 rests upon the plate 71 and is secured thereto in any suitable manner, as by screws 74. It will be noted in Fig. 7 that the screws engage elongated slots in plate 73 whereby the relative radial position ofplate 73 on plate 71 may be altered as needed. Plate 7 3 has an upwardly bent and laterally extending arm 75 at its end remote from the direction of approach of the yarn changer and needle cams and said arm supports a vertical pin 54 (previously mentioned) by which the star wheel 53 is rotated and by which also the shear blade operating arm 64 is operated. It will be noted that plate 71 must be raised to various elevations for operating on the different lugs 25 of the actuators 20 but the length of pin 54 is such that in any position of plate 71 it will engage and operate the star wheel and the lever 64.

Below the plate 71 the bracket 7 O supports a horizontal pin 76 which is preferably spring-impelled toward the axis of the machine and which is so located as to engage all the tails 33 of detents 27, thereby releasing the actuators of all the yarn guides and permitting the springs 17 to move toward idle position any yarn linger except that one whose actuator is at the moment under control of the cam face 72 of plate 71, which may be either the actuator of a yarn guide already in feeding position or may be the actuator of a yarn guide just being placed in feeding position. The operation of the pin 76 is bri-ef and therefore the cam face 72 will hold 'the desired actuator in place until after its detent shall have returned to holding position, after which the pin 54 will strike an arm of the star wheel to rotate the pinions 39 and 40 for clamping an idled yarn and immediately ythereafter said pin 54 will engage arm 64- for cutting off the idled yarn which has been clamped by the pinions 39 and 40.

The yarn of the guide which has now been placed in feeding position across the needle row is now taken by the needles, the end of the yarn which hasv been held between the pinions being released in the rotation of the pinions to clamp the newly idled yarn. It will be understood that only one yarn may be fed to the needles or by addition of other plates 71, a plurality of yarns may be so fed, as may be desirable, the ends of all idle yarns beinglield by the pinions.

It will be obvious to those skilled in the art that various modications may be made in my device without departing from the spirit of my invention and therefore I do not limit myself to what is shown in the drawings and described in the specification but only as indicated in the appended claims.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent is:

1. Ina yarn changer for knitting machines, a series of yarn lingers, a common pivot for said fingers, a series of parallel horizontally slidable actuators for moving the respective lingers toidle position, individual springs for returning the lingers to feeding position, yarn-cutting means in advance of said fingers comprising a fixed cutting blade and a movable cutting blade; yarn-clamping means including a pair of intermeshing pinions between the fingers and the cutting blades; and pattern controlled means acting selectively on the yarn lingers for operating said cutting and clamping means.

2. A device as in claim l, said pattern controlled means including an element acting successively on the cutting and clamping devices to operate them.

3. In a yarn changer for knitting machines,

a plurality of yarn guides selectively movable to feeding position, yarn clamping means comprising a pair of intermeshing pinions, a

shaft carrying one of said pinions, and means ,0 acting in timed relation to idle a yarn linger and to rotate said pinions for clamping the yarn controlled by said linger.

4. In a yarn changer for knitting machines, a plurality of yarn guides selectively movable to feeding position, yarn clamping means comprising a pair of intermeshing pinions, a shaft carrying one of said pinions, yarn cutting means, and means acting in timed relation to idle a yarn finger, to clamp its yarn and to cut off said yarn.

5. In a yarn changer for knitting machines,

a plurality of yarn guides selectively movable to feeding position, yarn clamping means comprising a pair of intermeshing pinions, a

shaft carrying one of said pinions, a star Wheel connected to said shaft, yarn-cutting means including an actuating lever having an arm movable in a plane parallel to that of the star Wheel, and pattern controlled means 50 including a common operating element for the lever and the star Wheel.

6. In a yarn changer for knitting machines, a. plurality of yarn guides selectively movable to feeding position, yarn clamping means comprising a pair of intermeshing pinions, a shaft carrying one of said pinions, yarn cutting means, means acting in timed relation to idle a yarn finger, to clamp its yarn and to cut off said yarn, said means comprising a vertical series of pattern controlled devices selectively movable for actuating the cutting and clamping means, and for moving an idle yarn linger to feeding position.

7. In a yarn changer for knitting machines,

a plurality of yarn guides selectively movable to feeding position, yarn clamping means comprising a pair of intermeshing pinions, a shaft carrying one of said pinions, a star Wheel connected to said shaft, yarn-cutting means including an actuating lever having an arm movable in a plane parallel to that of the star Wheel, and pattern controlled means including a common operating element for the lever and the star Wheel said pattern controlled means also including elements movable relatively to said yarn feed for moving an idle yarn finger to feeding position.

8. In a yarn changer, yarn clamping means comprising a pair of intermeshing pinions for clamping a yarn between them., one of said pinions having teeth extending individually beyond its end face for catching a. yarn to be held by said clamping means.

In testimony whereof I aiiiX my signature.

HARRY B. AARONSON. 

